Dr. Slick Ceramic Bobbin use Plastic Inserts?

I just got my bobbin today and to me it looks and feels just like plastic. Is it really ceramic?
I may not have a whole lot of experience with all types of ceramic, but the feel and look of it doesn't look as good as the ceramic I have seen. Even has carving marks like when you shave off excess plastic off with a razor blade.
Picture shows the little tab thing that you usually find on plastic model parts.

It's plastic ceramic. You're right, doesn't look like any ceramic bobbins I've used. Actually, I've switched to bobbins that use a carbide steel sleeve at the tip and no longer use ceramic sleeve bobbins. I don't think I'll have a problem with the thread grooving the tube.

It is probably a ceramic-"type" bobbin if you can see cut or machining marks on it. Often faux products are a generic imitation of the real thing made to look identical but are not really the same. Hence the warning 'caveat emptor'.

Remember the term 'Mag Wheels' from years ago? Well, there were real magnesium wheels at the time but they were mostly on Formula I cars or high performance race cars. The cheap knockoffs called mag wheels in those days were actually crude cast aluminum that cost a fraction of what a real mag wheel cost and were much heavier.

Same with early 'graphite' rods some of which hardly contained any graphite but were graphite colored and therefore sold as the real thing.

It's plastic ceramic. You're right, doesn't look like any ceramic bobber I've used. Actually, I've switched to bobbers that use a carbide steel sleeve at the tip and no longer use ceramic sleeve bobbins. I don't think I'll have a problem with the thread grooving the tube.

I feel scammed They should just label them what they are instead of trying to trick people into buying what is good, but selling them a lesser product.. They should have just called it plastic.. I'm sure it works good, but I don't buy diamonds, to later find out that I got CZs..

Tag part on the ceramic insert is where the ceramic is broken away from its mate. Comes in sheets of 5000 units. They are then broken free 1 at a time, reamed with a bit to produce the funnel and then roll polished in a drum. Final assembly is done by placing the insert into the stainless tube. Then I face each unit on a buffing wheel to smooth and round the insert. Each unit is then thread tested to make sure it works. I'm not sure why anyone would assume this is plastic. Plastic inserts would melt in 2 of the above steps.